This damn Russian bot has been trying to create fraudulent orders with stolen credit cards multiple times every day and Shopify blocks it 100% of the time. The bot used to not sign up for my email list, but all of a sudden now it is. Most of the time it used fake emails, but sometimes they'd use a real one and that person would mark me as spam.
So now my store's email is blacklisted by Comcast and I had to appeal, all because of that Russian bot.
Made a lot of changes to my opt-in process to keep the bot from continuing to put me on blacklists.